Triggering beamformed up link physical layer protocol data units
A system and method for triggering beamformed uplink (UL) physical layer protocol data units (PPDUs) are disclosed. The system comprises an access point (AP) and one or more stations (STAs). The AP sends a soliciting frame to the one or more STAs, wherein the frame comprises a null data packet, NDP, request, NDPR, indicator and receive an NDP PPDU from each of the one or more solicited STAs. The AP, then computes the precoder for each of the one or more solicited STAs and send the one or more solicited STA a trigger frame with a beamforming report. The AP receives from each of the STAs one or more beamformed UL data packets and sends a block acknowledgement to the one or more solicited STAs indicating the successful receipt of the one or more beamformed UL data packets.
1 . An access point (AP) communication device comprising:
a transceiver, the transceiver being configured to:
send a null data packet request (NDPR) trigger frame (TF) to one or more stations (STAs), wherein the NDPR TF comprises an NDPR indicator that is configured to initiate sending of an uplink NDP physical protocol data unit (PPDU) from the one or more STAs; and
receive an NDP PPDU from each of the one or more solicited STAs.
2 . The AP communication device according to claim 1 , wherein the NDP PPDU received from the one or more STAs comprises one of multiplexing of:
uplink (UL) orthogonal frequency division multiplexing access (OFDMA),
UL multi user multiple input multiple output (MU-MIMO), or
a combination of OFDMA and MU-MIMO.
3 . The AP communication device according to claim 1 , further comprising at least one processor and a memory storing instructions to be executed by the at least one processor, the at least one processor when executing the instructions being configured to:
compute a precoder for an uplink (UL) data packet transmission based on the received NDP PPDU(s) from the one or more STAs.
4 . The AP communication device according to claim 1 , wherein the transceiver is further configured to:
transmit a beamforming report to the one or more STAs, or a subset of the one or more STAs, wherein the beamforming report is contained in a second trigger frame soliciting UL data or the beamforming report is transmitted with the trigger frame soliciting UL data, in a same PPDU.
5 . The AP communication device according to claim 4 , wherein the transceiver is further configured to:
receive from each of the one or more STAs, or a subset of the one or more STAs, UL data packets which are beamformed according to the beamforming report.
6 . The AP communication device according to claim 5 , wherein one or more UL data packets received from the one or more STAs, or the subset of one or more STAs, comprise an indication signal which indicates that the one or more UL data packets are beamformed.
7 . The AP communication device according to claim 4 , wherein the beamforming report comprises narrowband and/or wideband precoding.
8 . The AP communication device according to claim 7 , wherein the beamforming report comprises a minimum size of resource allocation of 242 tones for wideband precoding, to support UL beamforming.
9 . The AP communication device according to claim 4 , wherein the beamforming report comprises a compressed narrowband beamforming report bit and/or a compressed wideband beamforming report bit.
10 . The AP communication device according to claim 4 , wherein the beamforming report is given in a resolution of 20 MHz.
11 . The AP communication device according to claim 1 , wherein the transceiver is further configured to:
send a block acknowledgement (BACK) to the one or more STAs, or the subset of one or more STAs in response to receiving the UL data packets which are beamformed from the one or more STAs, or a subset of one or more STAs.
12 . The AP communication device of claim 1 , wherein the transceiver is further configured to:
send an NDPR which comprises a sub type field and a STA Info field which comprise information that enables disambiguation between frame formats of very high throughput (VHT), high efficiency (HE) and extremely high throughput (EHT).
13 . The AP communication device according to claim 1 , wherein the NDPR indicator is a value corresponding to an NDP request for UL Sounding (NRUL).
14 . A station (STA) comprising:
a transceiver, the transceiver being configured to:
receive a null data packet request (NDPR) trigger frame (TF) from an access point (AP), wherein the NDPR TF comprises an NDPR indicator that is configured to initiate sending of an uplink NDP physical protocol data unit (PPDU) from one or more STAs; and
send an NDP PPDU to the AP.
15 . The STA according to claim 14 , wherein the NDP PPDU comprises one of multiplexing of:
uplink (UL) orthogonal frequency division multiplexing access (OFDMA),
UL multi user multiple input multiple output (MU-MIMO), or
a combination of OFDMA and MU-MIMO.
16 . The STA according to claim 14 , wherein the transceiver is further configured to:
receive a precoder for an uplink (UL) data packet transmission computed by the AP based on the NDP PPDU.
17 . The STA according to claim 14 , wherein the transceiver is further configured to:
receive a beamforming report from the AP, wherein the beamforming report is contained in a second trigger frame (TF) soliciting UL data or the beamforming report is transmitted with the TF soliciting UL data, in a same PPDU.
18 . The STA according to claim 17 , wherein the transceiver is further configured to:
send UL data packets to the AP, which are beamformed according to the beamforming report, in response to the TF soliciting UL data.
19 . The STA according to claim 17 , wherein the beamforming report comprises a compressed narrowband beamforming report bit and/or a compressed wideband beamforming report bit.
20 . The STA according to claim 14 , wherein the NDPR indicator is a value corresponding to an NDP request for UL Sounding (NRUL).